diff --git a/proxmox-time/src/calendar_event.rs b/proxmox-time/src/calendar_event.rs
index c70d9eae..59f61a7f 100644
--- a/proxmox-time/src/calendar_event.rs
+++ b/proxmox-time/src/calendar_event.rs
@@ -427,7 +427,7 @@ fn parse_time_spec(i: &str) -> IResult<&str, TimeSpec> {
         opt(preceded(tag(":"), parse_date_time_comp_list(0, 60))),
     ))(i)?;
 
-    let hour = opt_hour.unwrap_or_else(Vec::new);
+    let hour = opt_hour.unwrap_or_default();
     let second = opt_second.unwrap_or_else(|| vec![DateTimeValue::Single(0)]);
 
     Ok((
diff --git a/proxmox-time/src/daily_duration.rs b/proxmox-time/src/daily_duration.rs
index 37c4f6ab..078cf79c 100644
--- a/proxmox-time/src/daily_duration.rs
+++ b/proxmox-time/src/daily_duration.rs
@@ -14,7 +14,7 @@ use crate::{parse_weekdays_range, WeekDays};
 use crate::TmEditor;
 
 /// Time of Day (hour with minute)
-#[derive(Default, PartialEq, Clone, Debug)]
+#[derive(Clone, Debug, Default, Eq, PartialEq)]
 pub struct HmTime {
     pub hour: u32,
     pub minute: u32,
diff --git a/proxmox-time/src/posix.rs b/proxmox-time/src/posix.rs
index 6a8ab700..d8a9130d 100644
--- a/proxmox-time/src/posix.rs
+++ b/proxmox-time/src/posix.rs
@@ -175,6 +175,8 @@ pub fn epoch_to_rfc3339_utc(epoch: i64) -> Result<String, Error> {
 
 /// Convert Unix epoch into RFC3339 local time with TZ
 pub fn epoch_to_rfc3339(epoch: i64) -> Result<String, Error> {
+    use std::fmt::Write as _;
+
     let localtime = localtime(epoch)?;
 
     let year = localtime.tm_year + 1900;
@@ -199,7 +201,7 @@ pub fn epoch_to_rfc3339(epoch: i64) -> Result<String, Error> {
 
     let mut s = strftime("%10FT%T", &localtime)?;
     s.push(prefix);
-    s.push_str(&format!("{:02}:{:02}", hours, mins));
+    let _ = write!(s, "{:02}:{:02}", hours, mins);
 
     Ok(s)
 }